Storm overflows spike to 101 across England and Wales as thunderstorms sweep in

Mason's ledger flagged 101 storm overflows discharging across England and Wales for the hour, more than four times the usual count of 23. The spike lines up with a band of heavy, thundery rain reported moving across the Midlands and Wales, alongside flash flooding already under way in Birmingham, according to [1]. West Midlands Fire Service confirmed it had been called to "significant flooding" in the Perry Barr area of Birmingham after a flood warning was issued overnight due to rising river levels, according to [1]. Crews were reported working alongside West Midlands Police and Birmingham City Council, with the public told to avoid the area where possible. Incidents were also logged around Curbar Road, Thornbridge Avenue and Haddon Road, according to [1]. The city council separately advised people to avoid walking, cycling or driving through flood water, according to [1]. The Environment Agency had issued 22 flood alerts across the Midlands and South East, meaning flooding was considered possible rather than imminent in those areas, according to [1]. Two Met Office yellow thunderstorm warnings were in force: one for London and the South East running until 8am Thursday, and a second, larger warning covering Wales and much of England from 5am to 10pm, according to [1]. Rainfall totals forecast for Thursday were substantial enough to explain a surge in overflow activity — the Met Office's Craig Snell told [1] that some areas could see 50-75mm of rain, with the wider warning area potentially exceeding 75mm over 12 hours in parts, plus lightning and hail up to 1-2cm across the South East. Snell described a "band of potentially heavy rain and thundery rain stretching across parts of the UK" as the day began, with the Midlands and Wales facing "quite a wet day really", according to [1]. Context matters here: this deluge follows an unusually hot and dry spell, with drought declared across nearly three-quarters of England and the whole of Wales, after five heatwaves and temperatures reaching 38.1C in London, according to [1]. Parched ground and stressed drainage systems are a plausible, though unconfirmed, contributing factor to how quickly overflows are triggering — the source material does not draw that link explicitly, so it should be treated as a reasonable inference rather than an established cause. A separate Met Office regional forecast for Wales, filed around the same period, describes a different, more settled pattern — westerly winds, scattered showers and maximum temperatures of 15C, with no mention of thunderstorms, flooding or heavy rain, according to [2]. That forecast does not appear to correspond to the same event described in [1]; the discrepancy is unexplained in the material and should not be read as contradicting the Birmingham flooding report. Further heavy rain and thunderstorms were forecast for Friday, with more rain arriving Saturday and a mix of sunshine and showers over the bank holiday weekend, according to [1]. Snell summarised the outlook as "pretty unsettled" with "some sunny moments in between if you can dodge the downpours," according to [1]. What to watch next: whether the overflow count falls back toward the 23 baseline as the Thursday evening thunderstorms clear the South East, or whether Friday's forecast heavy rain pushes discharges higher again.